Crown ether microfunctionalized carbon nanotubes for dispersive micro-solid-phase extraction of sudan dyes and their metabolites

Trace-level detection of sulfonamide antibiotics using quaternary ammonium polymeric ionic liquid-based effervescence-enhanced dispersive solid-phase extraction followed by LC-DAD analysis in environmental waters

“…To realize rapid dispersion, adsorption, and elution of analytes, sorbents with large specific surface area, high adsorption efficiency, and good dispersive ability are required in the d-SPE techniques. Compared to inorganic sorbent materials such as carbon, 16 silica, 17 and metal–organic frameworks (MOFs), 18 organic materials have a wider variety of functional groups, which may improve the extraction efficiency and sorbent selectivity. 19 Among organic materials, ionic liquids (ILs) are deemed as “green” extraction media and have designable structures, which provide multiple interactions with target molecules, including hydrophobic/hydrophilic interactions, hydrogen bonding, π–π conjugation, ion-exchange, and electrostatic attraction or repulsion.…”

Ultrasound assisted supramolecular liquid phase microextraction procedure for Sudan I at trace level in environmental samples

“…Sudan dyes has been determined so far by many methods such as ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UHPLC-Q-TOF/MS) [11] , high-performance liquid chromatography (HPLC) [12], Capillary liquid chromatography (CLC) [13], ultrafast liquid chromatography (UFLC) [14]. However, these devices are relatively complicated, expensive, relatively difficult to use, require consumables, and require long analysis processes.…”

Dendrimer crown-ether tethered multi-wall carbon nanotubes support methyltrioxorhenium in the selective oxidation of olefins to epoxides

“…1,2 They show surface defect sites for the anchoring of spacer chains and selective recognition sites, as for example for crown ethers. 3 Different applications of MWCNTs-crown ether functionalized systems are reported, 4 including dispersive microsolid phase extraction procedures, 5 exchange reaction in quasi-solid-state processes, 6 absorption of metals and organic pollutants, 7 and ion-detection. 8 In these latter cases, MWCNT-crown ether tethered poly(amidoamine) (PAMAM) dendrimers received increasing attention.…”